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  1. chopnhack

    Panasonic viera tv help

    First thing I would do is download a schematic if you can find one. I had a similar problem on a Acer monitor that turned out to be a bad capacitor - this is a frequent mode of failure with electronics. The caps filter the power supply coming into the remaining circuitry. Bad signals coming...
  2. chopnhack

    Assistance with Transistor Theory

    @Laywah - aside the deep theory, I wanted to share this with you, because up until just stumbling across it, I had never had this explained so easily to me!! Our more advanced members will probably say, well of course, but for me NPN and PNP where really nothing more than labels!! NPN...
  3. chopnhack

    Where to buy components?

    Hi Ben, you won't get it right away, but your best value is probably going to come from E-Bay via China - I got an assortment of zener's for next to nothing delivered. Just had to pay in "time". They were the radial, leaded type. I don't know if you can find an assortment of smt style zener's.
  4. chopnhack

    555 monostable help

    Quick google search says between 300-360khz before they become unstable, but your mileage may vary...
  5. chopnhack

    Help Getting Started with PIC Microcontrollers

    That is more my speed ;), you are right though, it is a bit pricey!
  6. chopnhack

    Help Getting Started with PIC Microcontrollers

    I tried to get the Dummies book from the library, they had a listing for the "C" version, but when the book came in it was c++. I took it anyway. I have been watching some video's on μcu's and can't honestly answer your question right now. Thanks for the review, I will try again to source it - I...
  7. chopnhack

    Help Getting Started with PIC Microcontrollers

    Sweet Dan, mine is coming too!!
  8. chopnhack

    ID'ing/replacing surface mount device

    It's true, it could have been a resistor as well. I would also be concerned about the traces on the board. Is the right most one still there?
  9. chopnhack

    ID'ing/replacing surface mount device

    That is a tough one and Gigabyte is not likely to divulge the data. I do believe it was a capacitor. Do you have the ability to un-solder the other caps and measure them? As you said, there is a good chance that they may be of similar values - no guarantee, but sometimes capacitors can be used...
  10. chopnhack

    Capacitor replacement

    The reason I had asked about the reverse side was to try and determine polarity. Is that a little "+" sign smashed between the outline of the capacitor and J6?
  11. chopnhack

    Capacitor replacement

    Can you take a picture of the back side of the board?
  12. chopnhack

    Soldering problem

    Just finished it and yep, already covered, LOL. Knowledge is additive though, right? :D
  13. chopnhack

    Soldering problem

    Careful with the wick - the wick needs to move with the iron - i.e. - when you remove the iron, the wick should be removed with it, otherwise, the solder may solidify with the wick and you can pull the trace right off the board. I have done this a few times too... If in doubt - don't pull the...
  14. chopnhack

    Soldering problem

    I would not be making new holes in that board given its a multi layer board, you could inadvertently short or puncture a signal layer trace. Are you just trying to re-open the hole where the old part was in? Did the solder reflow over the hole when you pulled out the through hole component?
  15. chopnhack

    Soldering problem

    Good job! Go slow.
  16. chopnhack

    Soldering problem

    Agreed, and pushing harder does not help transfer heat any better :rolleyes: don't ask me how I know! Traces start to lift as the adhesive that is used to fix the copper sheet to the substrate melts before the solder does. The few boards I have worked on or scavenged were very hard to get...
  17. chopnhack

    Soldering problem

    Sometimes the lead free solder is harder to rework. Do you have any flux gel or a flux pen you can use?
  18. chopnhack

    Projects involving vintage CPUs

    Agreed, I assume that this is the case when you have to actually move the individual registers or "gates" of the chip - that is why the abstraction, programming languages can achieve so much using so few lines in comparison.
  19. chopnhack

    Running a UK 230V system at 220V in the US

    I am not sure that is correct... I have limited experience with what I consider more industrial power supplies, but what you are describing @Bluejets sounds like a high leg delta supply which would yield three different voltages and the voltage between phase and neutral is 208 not 240v - the...
  20. chopnhack

    Displaying multiple outputs on the same seven segment with a time difference of two seconds

    Welcome the the forum Deena! What would happen if one candidate got all the votes? All the 7 segment units would all read 00. Not saying its likely, but its something to consider if the results are important.
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